Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d4c6851ca4f200…

MALICIOUS

PDF

37.6 KB Created: 2020-08-27 14:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c263f6935cbb15cfc30abbbd48dfbc64 SHA-1: d3d27326aa28d838c555357d16a074f3301b63c0 SHA-256: 50d4c6851ca4f20062493780e88cb1f332c5f0f986921d6ef0df0c2a85b0c71f
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier also flagged this PDF with high confidence. The document body text, though heavily obfuscated, contains the URL "https://ttraff.cc/pify?keyword=literary+analysis+essay+rubric+pdf", suggesting a lure to disguise malicious activity. The presence of numerous other PDF links further indicates a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=literary+analysis+essay+rubric+pdf
    • http://kogowuxo.oliviacliftonbligh.com/uploads/1/3/2/8/132814930/satenojov-sofigo-rivavu.pdf
    • http://vedifave.findingancestorsmadeeasy.com/uploads/1/3/1/4/131453197/kuvov.pdf
    • http://zulene.iamjessrenee.com/uploads/1/3/1/8/131857631/temojuxated.pdf
    • http://files.kaelymonahan.com/uploads/1/3/1/6/131636954/zijirijigunarid.pdf
    • https://cdn.shopify.com/s/files/1/0430/7930/3317/files/varijetejigepo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1946/7927/files/komaxapurokowapefero.pdf
    • https://cdn.shopify.com/s/files/1/0431/4991/8374/files/48682070477.pdf
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/86244288393.pdf
    • https://cdn.shopify.com/s/files/1/0439/4621/3544/files/tablas_de_atmosfera_estandar.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/chahun_main_ya_naa_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0433/1801/8216/files/42573384624.pdf
    • https://cdn.shopify.com/s/files/1/0433/5550/4795/files/55794575989.pdf
    • https://cdn.shopify.com/s/files/1/0429/5848/7703/files/best_app_annotate_ipad.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/capteur_de_pression_capacitif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005705.bin
9742acf8622dc52a73f9bcd2ea3712bfce485c578d23735ec6ed038f983e0d55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5705 5332 bytes
font_01_sfnt_off0000692e.bin
3e0c83757cbd84c7470e77af67770a1b8f892c48cde05c87f8672757007e9ac1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x692E 9524 bytes

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